214 research outputs found
Semantic Face Compression for Metaverse: A Compact 3D Descriptor Based Approach
In this letter, we envision a new metaverse communication paradigm for
virtual avatar faces, and develop the semantic face compression with compact 3D
facial descriptors. The fundamental principle is that the communication of
virtual avatar faces primarily emphasizes the conveyance of semantic
information. In light of this, the proposed scheme offers the advantages of
being highly flexible, efficient and semantically meaningful. The semantic face
compression, which allows the communication of the descriptors for artificial
intelligence based understanding, could facilitate numerous applications
without the involvement of humans in metaverse. The promise of the proposed
paradigm is also demonstrated by performance comparisons with the
state-of-the-art video coding standard, Versatile Video Coding. A significant
improvement in terms of rate-accuracy performance has been achieved. The
proposed scheme is expected to enable numerous applications, such as digital
human communication based on machine analysis, and to form the cornerstone of
interaction and communication in the metaverse.Comment: 5 pages, 3 figure
Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime
The strong coupling between photons and matter excitations such as excitons,
phonons, and magnons is of central importance in the study of light-matter
interactions. Bridging the flying and stationary quantum states, the strong
light-matter coupling enables the coherent transmission, storage, and
processing of quantum information, which is essential for building photonic
quantum networks. Over the past few decades, exciton-polaritons have attracted
substantial research interest due to their half-light-half-matter bosonic
nature. Coupling exciton-polaritons with magnetic orders grants access to rich
many-body phenomena, but has been limited by the availability of material
systems that exhibit simultaneous exciton resonances and magnetic ordering.
Here we report magnetically-dressed microcavity exciton-polaritons in the van
der Waals antiferromagnetic (AFM) semiconductor CrSBr coupled to a Tamm plasmon
microcavity. Angle-resolved spectroscopy reveals an exceptionally high
exciton-polariton coupling strength attaining 169 meV, demonstrating
ultrastrong coupling that persists up to room temperature.
Temperature-dependent exciton-polariton spectroscopy senses the magnetic order
change from AFM to paramagnetism in CrSBr, confirming its magnetic nature. By
applying an out-of-plane magnetic field, an effective tuning of the polariton
energy is further achieved while maintaining the ultrastrong exciton-photon
coupling strength, which is attributed to the spin canting process that
modulates the interlayer exciton interaction. Our work proposes a hybrid
quantum platform enabled by robust opto-electronic-magnetic coupling, promising
for quantum interconnects and transducers.Comment: 8 pages, 4 figure
Comprehensive Analysis and Functional Studies of WRKY Transcription Factors in Nelumbo nucifera
The WRKY family is one of the largest transcription factor (TF) families in plants and plays central roles in modulating plant stress responses and developmental processes, as well as secondary metabolic regulations. Lotus (Nelumbo nucifera) is an aquatic crop that has significant food, ornamental and pharmacological values. Here, we performed an overview analysis of WRKY TF family members in lotus, and studied their functions in environmental adaptation and regulation of lotus benzylisoquinoline alkaloid (BIA) biosynthesis. A total of 65 WRKY genes were identified in the lotus genome and they were well clustered in a similar pattern with their Arabidopsis homologs in seven groups (designated I, IIa-IIe, and III), although no lotus WRKY was clustered in the group IIIa. Most lotus WRKYs were functionally paired, which was attributed to the recently occurred whole genome duplication in lotus. In addition, lotus WRKYs were regulated dramatically by salicilic acid (SA), jasmonic acid (JA), and submergence treatments, and two lotus WRKYs, NnWRKY40a and NnWRKY40b, were significantly induced by JA and promoted lotus BIA biosynthesis through activating BIA biosynthetic genes. The investigation of WRKY TFs for this basal eudicot reveals new insights into the evolution of the WRKY family, and provides fundamental information for their functional studies and lotus breeding
Anti-embolism devices therapy to improve the ICU mortality rate of patients with acute myocardial infarction and type II diabetes mellitus
BackgroundAnti-Embolism (AE) devices therapy is an additional antithrombotic treatment that is effective in many venous diseases, but the correlations between this medical compression therapy and cardiovascular arterial disease or comorbid diabetes mellitus (DM) are still controversial. In this study we investigated the association between compression therapy and intensive care unit (ICU) mortality in patients with a first acute myocardial infarction (AMI) diagnosis complicated with type II DM.MethodsThis retrospective cohort study analyzed all patients with AMI and type II DM in the Medical Information Mart for Intensive Care-IV database. We extracted the demographics, vital signs, laboratory test results, comorbidities, and scoring system results of patients from the first 24 h after ICU admission. The outcomes of this study were 28-day mortality and ICU mortality. Analyses included Kaplan–Meier survival analysis, Cox proportional-hazards regression, and subgroup analysis.ResultsThe study included 985 eligible patients with AMI and type II DM, of who 293 and 692 were enrolled into the no-AE device therapy and AE device therapy groups, respectively. In the multivariate analysis, compared with no-AE device therapy, AE device therapy was a significant predictor of 28-day mortality (OR = 0.48, 95% CI = 0.24–0.96, P = 0.039) and ICU mortality (OR = 0.50, 95% CI = 0.27–0.90, P = 0.021). In addition to age, gender and coronary artery bypass grafting surgery, there were no significant interactions of AE device therapy and other related risk factors with ICU mortality and 28-day mortality in the subgroup analysis.ConclusionsSimple-AE-device therapy was associated with reduced risks of ICU mortality and 28-day mortality, as well as an improvement in the benefit on in-hospital survival in patients with AMI complicated with type II DM
Controlling the 2D magnetism of CrBr by van der Waals stacking engineering
The manipulation of two-dimensional (2D) magnetic order is of significant
importance to facilitate future 2D magnets for low-power and high-speed
spintronic devices. Van der Waals stacking engineering makes promises for
controllable magnetism via interlayer magnetic coupling. However, directly
examining the stacking order changes accompanying magnetic order transitions at
the atomic scale and preparing device-ready 2D magnets with controllable
magnetic orders remain elusive. Here, we demonstrate effective control of
interlayer stacking in exfoliated CrBr via thermally assisted strain
engineering. The stable interlayer ferromagnetic (FM), antiferromagnetic (AFM),
and FM-AFM coexistent ground states confirmed by the magnetic circular
dichroism measurements are realized. Combined with the first-principles
calculations, the atomically-resolved imaging technique reveals the correlation
between magnetic order and interlay stacking order in the CrBr flakes
unambiguously. A tunable exchange bias effect is obtained in the mixed phase of
FM and AFM states. This work will introduce new magnetic properties by
controlling the stacking order, and sequence of 2D magnets, providing ample
opportunities for their application in spintronic devices.Comment: 7 pages, 4 figure
Advances in the research, diagnosis and treatment of renal cell carcinoma in 2022
Renal cell carcinoma (RCC) is one of the three major urinary system tumors. With the changes of lifestyle and the rise of obesity, hypertension and other diseases, the incidence of RCC is increasing. The onset of RCC is hidden, and RCC has strong heterogeneity. Most RCC patients are found accidentally by imaging examination, so many patients were diagnosed in the advanced stage. Although the emergence of targeted therapy and immunotherapy has greatly prolonged the survival time of patients with advanced RCC, due to many pathological types of RCC, it is still difficult for many patients to benefit from the systematic treatment. Many basic and clinical studies are devoted to the development of new targets or drugs to prolong the survival time of patients. This article reviewed the advances in the research, diagnosis and treatment of RCC in 2022
Ferromagnetic-antiferromagnetic coexisting ground states and exchange bias effects in and
Natural superlattice structures ( = 1,
2,...), in which magnetic layers are separated by nonmagnetic
layers, hold band topology, magnetism and reduced interlayer
coupling, providing a promising platform for the realization of exotic
topological quantum states. However, their magnetism in the two-dimensional
limit, which is crucial for further exploration of quantum phenomena, remains
elusive. Here, complex ferromagnetic (FM)-antiferromagnetic (AFM) coexisting
ground states that persist up to the 2-septuple layers (SLs) limit are observed
and comprehensively investigated in ( = 1) and
( = 2). The ubiquitous Mn-Bi site mixing modifies or
even changes the sign of the subtle inter-SL magnetic interactions, yielding a
spatially inhomogeneous interlayer coupling. Further, a tunable exchange bias
effect is observed in ( = 1, 2), arising
from the coupling between the FM and AFM components in the ground state. Our
work highlights a new approach toward the fine-tuning of magnetism and paves
the way for further study of quantum phenomena in
( = 1, 2,...) as well as their magnetic
applications.Comment: 9 pages, 4 figure
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